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Brain nitric oxide synthase is a haemoprotein.

P Klatt1, K Schmidt, B Mayer

  • 1Institut für Pharmacokologie und Toxikologie, Karl-Franzens-Universität Graz, Austria.

The Biochemical Journal
|November 15, 1992
PubMed
Summary

Brain nitric oxide synthase contains haem, a component essential for its function. Inhibitors like carbon monoxide confirmed that this enzyme-bound haem is crucial for nitric oxide synthesis.

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Area of Science:

  • Biochemistry
  • Neuroscience
  • Enzymology

Background:

  • Nitric oxide (NO) is a critical signaling molecule in the brain.
  • The enzymatic pathway for NO synthesis involves nitric oxide synthase (NOS).
  • The precise role of cofactors in NOS activity requires further elucidation.

Purpose of the Study:

  • To characterize the cofactor content of purified brain nitric oxide synthase.
  • To investigate the involvement of enzyme-bound haem in the catalytic activity of NOS.
  • To determine the functional significance of haem in NO synthesis.

Main Methods:

  • Spectroscopic analysis (pyridine haemochrome) to identify haem presence.
  • Quantification of haem content in purified NOS preparations.
  • Enzyme activity assays measuring L-citrulline formation in the presence of various inhibitors (CO, NO, KCN, miconazole).

Main Results:

  • Brain NOS exhibited pyridine haemochrome spectra indicative of ferroprotoporphyrin IX.
  • Haem content was quantified at 0.7-0.9 mol per 160 kDa subunit.
  • Inhibition of NOS activity was observed with CO, NO, KCN, and miconazole, suggesting haem involvement.

Conclusions:

  • Brain nitric oxide synthase is a haem-containing enzyme.
  • Enzyme-bound haem is demonstrably involved in the catalytic process of nitric oxide synthesis.
  • These findings highlight the functional importance of haem in NOS activity.

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